Lens for eyeglasses.



W. K. KIGHT. I

I LENS FOR EYEGLASSES.

APPLICATION FILED 3111.16, 1909.

1,022,789. Patented Apr. 9, 1912.

UNITED s ATEs PATE T or moE.

wILLrAm K. near, or DEXTER, MISSOURI.

mans on. nynemssns.

To all whom it may concern: 7

Be it known. that I, WIL IAM K. .KIGHT, a citizen of the United States,residing at Dexter, Stoddard county, Missouri, have invented a certainnew and useful Improve? ment in Lenses for Eyeglasses,-of which theimprovement in lenses for eye glasses, being designed particularly as animprovement upon tri-focal lenses illustrated in my Patent No. 896,393,dated August 18th, 1908.

The object of my present invention is to provide the main lenswith-beveled steps or shoulders instead of the abrupt angular shouldersillustrated in my aforesaid patent, for the purpose of-malgingithe linesofde- .marcation between the lenses so fine that they will not interferewith the ViSlOIl' of the wearer. V In the drawings, 1 indicates the mainlens provided with beveled shoulders A and B,

i 2 is.the reading lens,'so called, the upper edge of which is beveledand fitting against.

shoulder A so as to. be flush therewith.

'3 indicatesthe lens for the intermediate vision, the upper edgeof whichis beveled so as to fit snugly against the beveled shoulder B. This lens3 is positioned immediately over' the lens 2, and the outer face ofsaidlens 3 is flush with the corresponding face of the main lens 1.Lenses 2 and 3 are cemented or fused in position in a manner well knownin the 'art. It is, of course, understood that neither the lenses 2, or3 can be used separately as reading or inter mediate lenses, theyperforming these re spective functions in combination with each otherand the main lens 1.

' Specification of Letters Patent.

Application filed January 16, 1909, Serial No. 472,613.

Patented Apr. 9, 1912.

' It will be noted that th joints between the lenses 2 and 3 and themain lens 1, are

inclined or beveled, and the lines of .inclination of these joints areapproximately in the same plane with the lines of vision when the wearerof the eyeglasses is reading or walking, and for this reason the linesof demareation'between the various lenses are so fine as that they donot interfere with the vision of the wearer, which is the case Whereabrupt angular shoulders are formed between the edges of the lenses 2and 3. and 1, as 1s the casein my patent herein referred to.

Having thus described my invention what I claim is As anew article ofmanufacture, a trifocal lens for eyeglasses comprising a main lensfor-long distance vision provided with two depresslons in the lowerportion of its inner face, one' depression being smaller upper edges ofsaid depressions, a lens for short distance or reading vision arrangedinthe smaller one of the depressions and provided with a beveled edgecorresponding with and fitting against the beveled shoulder of thesmaller depression, and a lens for intermediate vision arranged over theshort distance lens and occupying the larger one of the depressions, theedge of whichintermediate vision lens is beveled to correspond with andfit against the beveled shoulder ofthe larger depression and the beveledjoints between the supplemental lenses and the. main lens being inclinedto correspond with the lines of vision of the wearer of the lenseswhereby the lines of demarcation between the supplemental lenses and themain lens are reduced to,-a minimum.

In testimony whereof "I hereunto 'alfix my signature in the presence oftwo witnesses, this 7th day of J any 1909. a

than and within the other, there being concentric beveled shouldersformed at the 7 VWILLIAMKQKIGHT.

Witnesses; I v J. F. BLA K SHIP,

' J. WILLIA'M CooK.

